The antennas are very high, there are no obstacles.
In /etc/config/wireless I have set "txpower '13'"
config wifi-device 'radio0'
option type 'mac80211'
option hwmode '11a'
option path 'platform/ahb/18100000.wmac'
option country 'IT'
option distance '1600'
option htmode 'HT20'
option legacy_rates '0'
option txpower '13'
option channel '44'
Why do I see "Tx-Power: 9 dBm" in Lucy?